Plate setting for cap jewels



Nov. 29, 1949 H. GERBER 2,489,570

PLATE-SETTING FOR CAP JEWELS Filed Oct. 8, 1946 F- 2 Awa /"06 A-Wz/456555 MJM Patented Nov. 29, 1949 aisatvo PLATE SETTING FOR CAP JEWELSHenri Gerber, Bienne, Switzerland, assignor to Omega Louis Brandt &Frere S. A., a joint-stock company Application October 8, 1946, SerialNo. 702,001 In Switzerland October 11, 1945 4 Claims. 1

This invention relates to plate settings for cap jewels. In small sizewatches it is often necessary to provide a plate-setting of oblong shapefor the cap jewel, that can be secured at one end by means of a screw,the cap jewel being set in the other end.

This construction has the disadvantage that the said plate-setting doesnot always lie perfectly flat on the surface provided as a seat with theresult that the face of the cap jewel comes to lie at an angle to theaxis of the balance, thus giving rise to defective working of the pivotof the verge, not to mention the fact that the oil will not easilyremain on the pivot.

The aim of my invention is to remedy these inconveniences. Thus, anobject of my invention is to ensure perfect seating of the said plate.Another object is to reduce the space taken up by this plate to aminimum. I obtain these aims by providing the feature that the contourof the rounded head portion forming the setting is bevelled, and thatthe tail end, likewise provided with bevelled surfaces, opens in theshape of a V, the head portion fitting into a bevelled undercut recessformed in the plate covering the balance and the V shaped tail end beingheld against the said plate by means of a screw with inverted cone head,so that on tightening the screw the plate-setting will be wedged intoits proper place, and consequently the cap jewel will lie flat in place.

The attached drawing shows, by way of example, an embodiment of theplate-setting according to the present invention.

Fig. 1 is a longitudinal section along the line II in Fig. 2, throughthe axes of the cap jewel and the wedge screw.

Fig. 2 is a plan view.

The plate I is milled so as to form a seat for the plate-setting. A hole3 is drilled in one end of this seat to receive the balance jewel, notrepresented, and near the other end, an internal thread 4 is made totake the wedge screw 5 with inverted cone head. The wall of the recessforming the seat spreads outward toward the bottom. The head portion 4of the plate setting has corresponding but, with respect to the bottomsurface of the recess, more obtusely bevelled contour and fits into thesaid recess. A hole having the same as the balance staff is drilled inthe platesetting, in which the cap jewel 8 is set. The semicircularcontour of the head portion forming the setting is continued by tworectilinear segments 8; at the other end, i. e. at the opposite end withrespect to the hole for the cap jewel, the plate-setting opens in theshape of a V, ill, with 2 rounded base, its inner edges being obtuselybevelled.

The screw 5 tightens on the bevelled edge of the V-shaped portion IS,pushing the plate-setting 2 longitudinally toward the bevelled end of:le recess. In this manner, the plate-setting is pressed down, under theaction of compounded forces, on to its seat, and the cap jewel isconsequently held flat in position.

The sides E l of the plate-setting 2 can be made curved to receive thejaws of pick pincers used to take hold of it when in the recess.

What I claim is:

1. In a watch movement, a plate having an undercut recess, a cap jewel,a plate setting comprising a rounded hollow head portion having abevelled contour and receiving said cap jewel and fitting by itsbevelled contour into said undercut recess, said plate setting furthercomprising a tail portion at the opposite end with a V-shaped openingprovided with a bevelled inner edge, and a screw with a head in contactwith said bevelled inner edge to force said plate-setting flat againstthe bottom of said undercut recess.

2. In a watch movement, a plate having a bevelled undercut recess, aplate setting comprising a rounded head portion having a semi-circularbevelled contour and a hole concentric with said contour, a cap jewelset into said hole, said plate setting fitting by its bevelled contourinto said bevelled undercut recess and comprising at the end opposite tosaid head portion a tail portion with a V-shaped opening provided with abevelled inner edge, and a screw screwed into said plate and providedwith an inverted cone head in contact with said bevelled inner edge toforce said plate-setting flat against the bottom of said beveliedundercut recess.

3. In a watch movement, a plate having a bevelled undercut recess, anoblong plate setting comprising a rounded head portion having asemi-eircular bevelled contour and a hole concentric with said contour,a cap jewel set into said hole, said plate setting fitting by itsbevelled contour into said bevelled undercut recess and comprising atail portion with a V-shaped opening provided with a bevelled inneredge, two rectilinear segments continuing said semi-circular contour,and curved portions connecting said rectilinear segments and said tailportion to permit pick pincers to take hold of said plate setting, and ascrew screwed into said plate and provided with an inverted cone head incontact with said bevelled inner edge to force said plate-setting flatagainst the bottom of said bevelled undercut recess.

4. In a watch movement, a. plate having an undercut recess, a cap jewel,a plate setting comprising a hollow head portion receiving said capjewel and fitting by its contour into said undercut recess in such amanner that on a lateral adjusting of said plate-setting the contour ofsaid head portion ls displaced along the contour of said undercut recesstowards the bottom of said recess, said plate setting further comprisinga tail portion at the opposite end with a notch provided with a bevelledinner edge, and a screw with a. head in contact with said bevelled inneredge to force said plate-setting flat against the bottom of saidundercut recess by lateral and axial pressure of said screw onto saidplate setting.

HENRI GERBER.

REFERENCES CITED The following references are of record in the file ofthis patent:

FOREIGN PATENTS Number Country Date 42,750 Switzerland Feb. 10, 190896,498 Switzerland Oct. 16, 1922 104,372 Switzerland May 1, 1924

